Step 1: Understanding Res Sub Judice:
The term "Res Sub Judice" means "a matter already under judicial consideration." The principle is based on avoiding multiplicity of proceedings. It ensures that no court shall proceed with the trial of any suit in which the matter in issue is also directly and substantially in issue in a previously instituted suit between the same parties.
Step 2: Legal Provision:
Section 10 of the Civil Procedure Code (CPC) incorporates this principle. It states that no court shall try any suit in which the matter in issue is also directly and substantially in issue in a previously instituted suit between the same parties, pending in the same or another competent court.
Step 3: Final Conclusion:
The correct answer is (A) Section 10 of CPC, which deals with the principle of Res Sub Judice.